Improvement in machine for double-seaming sheet-metal



@about @with Lam-Pawn No. 91,055, dated Jaws, 1869.

DEPRO'YEMENT IN MACHINE FOR DOUBLE-SEAMING- SHEET-METAL.

The Schedule referred to in thesezLettez-s Patent and malxlng part o! the same.

To allwhom it 'ma/y concern Y Be it known that I, ARCHIBALD TROLAN, of Norwich, in the county of New London, and State of Connecticut, have invented a new and improved Ma-k chine for Foldingl or Double-Seaming Sheet-Metal Roofing; and I do hereby declare that the following is a full, clear, and exact description of the construc- -tion and operation of the same, reference being had to the annexed drawings, making a part of this specication, in whichl- A Figure l is a vertical sectional view of the machine cut through the centre.

Figure 2 is a vertical sectional view ofone end, in which the folding-plate is drawn down in contact with the tin to be folded.

Figure 3 is a transverse section of the end, cut across the centret'as per line x, iig. 2, in which the locker-ing that projects into the folding-bar is shown. Figure 4 is a sectional View of a part of the centre of the machine, showing the clamp-screw that holds the removable plate by which the height of the ma chine is governed to it the work.

Figure 5 is an end view of the tin, after the first folding-movement. p

Figure 6 is an end view of the tin, after' the first fold is pressed down.

Figure 7 is an end view of the tin, after the second fold is turned and pressed down.

The object of the invention 4is to provide for public.. use a machine for folding or donble-seaming tin or sheet-metal roofing, and press the seams down tightly in a much more perfect and expeditious manner than has ever been done before.

-In the drawings, A indicates the frame of the machine.

B, the handle by which it is lifted from place to place.

C, the folding-bar, to which is attached the handle D, by whichl bar O is turned over to fold the tin.

E is a lever-handle, pivoted on pin e, for the purpose of closing the clamp-folding plate F against the tin g, as shown in g. 2, for the purpose of folding, as show n in iig. 5.

G is a spring that throws handle E down, and opens the folding-clamp F, when relieved by the hand, after folding the tin, as shown by g. 5.

His a projecting part on the frame A, -turned out true with the hole h, and projects into either end of the folding-bar C, thereby forming a guide that holds the folding-bar C up snug in the bearings of hole h.

I is the false bed, held to the machine by thumbscrew J, and used only when the rst fold of the tin is made, to raise the machine the proper height from the roof to close on the tin in the proper place, as shown by fig. 2, when the folding-clamp F is closed on to the tin, ready for folding, as shown by fig. 5.

, 4When the second fold is made, *the clamp is removed,pwhiol1 lets the machine down on the roof the thickness of the first fold, and in the right place for the second fold, or to clamp the tin,as shown at fig. 6, and folding, as shown at fig. 7.

The operation is as follows:

The tin is first placed upon the roof in the ordinaryway, with the edges Yturned up at right angles with the roof, and one about one-fourth of au inch above the other, as shown in g. 2.

The operator then takes the machine, (with the false bed 1 attached, as shown by fig. 1,) by handle B, places it over the uptnrned edges of the tin g, and with the other hand the operator closes the handle E' up to handle D, and thereby closing the folding-plate F against the highest of lthe upturned edges of the tin, and tightly clamps it against the folding-bar O, as

shown in fig. 2.

The handles D and E are then raised up while tightly closed together, which revplves the folding-bar and folds the tin over the point of folding-plate F, as shown in fig. 5. v I s A The operator then lets the handles spring apart, while in nearly a perpendicular position, and the fold` ing-plate F drops down, so as to clear `fold `g, fig. 5, when the handles or folder is let bak to the position` iig. 1, this operation being repeated the entire length of the seam, when the operator raises the machine, closing the handles D and E, thereby closing the folding-plate F close up to the folder C.

He then places the machine on the seam, and the handles are thrown over while being pressed tightly together, bringing the outside of the folding-plate F against the angling edge of the tin g, fig. 5, and pinches it against the front rail of the frame at K, closing the seam down tightly', as 4shown in fig. 6, and repeating the same movement the length of the seam.,

The bed I is then removed, which lets the machine down on the seam, and in the proper position to turn a double seam, which -is done by repeating ,the movements above described, which completes the work` and leaves the. seamas shown in fig-7.

theA purpose specied.

A. TROLAN.

Witnesses ALBERT S. BoLLEs, FRANK DOUGLAS. 

